The transition metal dichalcogenides (TMDCs) has the general formula MX2, where 'M' is a transition metal (M=W, Mo) from IVB, VB and VIB group of the periodic table and 'X' is one of the chalcogens namely S, Se and Te. Its basic structure is loosely couple X-M-X sheets which makes the material extremely interesting, because within a layer, the bonds are strong while between the layer they are remarkably weak. Significant optical to electrical/chemical energy conversion efficiencies have been obtained in solid state photovoltaic and photoelectrochemical solar cells with TMDC semiconductor-electrolyte interface.